One of the hallmark benefits of the Janisol Arte 2.0 system is its ultra-slim profiles, which are among the slimmest thermally broken steel window profiles available. Fixed glazing can feature mullions as thin as 25 mm face width (and optional 40 mm profiles for added stability where needed), enabling very delicate window fenestration. 

Despite their slender appearance, these profiles are engineered for strength – the steel allows intricate yet stable constructions that can support large expanses of glass without sacrificing rigidity. In fact, a single vent (opening sash) can be made up to approximately 1000 × 2400 mm in size and up to 150 kg in weight, which speaks to the robust capabilities of this system. 

Even at these sizes, the narrow frames stay true, ensuring maximum daylight admission and panoramic views through elegantly minimal frame lines.

For property owners and architects, the payoff is huge: more light, better views, and a chic “steel-and-glass” aesthetic that simply cannot be achieved with bulkier aluminum or vinyl alternatives. The narrow sightlines of our steel windows are often praised by clients who seek to maintain the delicate proportions of historic window glazing or to create a refined, modernist look. 

By using Janisol Arte 2.0, Portamet can match original steel window profiles from early 20th-century buildings with stunning accuracy, while also fulfilling 21st-century expectations for comfort and efficiency. The result is windows that honor architectural heritage and visual appeal, without the drafts and heat loss associated with old steel frames.

Janisol Arte 2.0 was originally conceived for the renovation of historic steel windows – such as those in factories, lofts, and listed heritage buildings – enabling like-for-like replacement of old thin metal windows with new units that preserve the original character. The system’s ultra-slim profiles allow for almost perfect reconstruction of historical window designs, whether inward or outward-opening, side-hung casements, double-vent (French) windows, bottom-hung awnings, top-hung outswing, projected top-hung, sliding, or even pivot windows. This means architects and conservation specialists can retain a building’s vintage industrial charm and sightlines while vastly improving its thermal and weather performance.

At the same time, Janisol Arte 2.0 is not only for period properties – it’s equally suited to modern buildings that desire a sleek, minimalist steel aesthetic. With narrow profile face widths (as slim as just 25 mm on fixed lights) and a basic frame depth of 60 mm, these windows produce gracefully thin sightlines and a high glass-to-frame ratio, flooding interiors with natural light. Portamet’s expertise with the Arte 2.0 system means we can deliver attractive slimline steel window solutions for cutting-edge residential designs, loft-style apartments, and contemporary commercial projects, not just classical restorations. In every case, our windows provide excellent thermal insulation and stability, meeting the highest standards for today’s performance requirements

When you choose Portamet’s steel windows, you are investing in premium materials that ensure longevity, beauty, and low maintenance. The Janisol Arte 2.0 profiles are available in three high-grade material options:

• Galvanized Steel: The classic choice – sturdy cold-formed steel profiles with a zinc coating for corrosion resistance. These can be finished in any RAL color or bespoke paint finish with durable powder coating or enamel. Steel offers superb strength and a sleek profile, and with proper galvanization and finishing, it resists rust for decades.

• Stainless Steel (Grade 1.4401): For coastal locations, ultra-modern aesthetics, or projects that demand exceptional durability, Arte 2.0 is offered in stainless steel. Stainless steel frames can be supplied with a brushed, satin, or polished finish, or even painted, combining the slim elegance of steel with the ultimate corrosion resistance.

• Corten Steel: Also known as weathering steel, Corten provides a unique rust-like appearance that matures over time, ideal for bold architectural statements. Janisol Arte 2.0 includes the option of Corten steel profiles, giving designers the freedom to create a lived-in, industrial look with genuine patina. Despite the rustic surface, the material maintains structural performance and is often used in heritage contexts or modern art-inspired designs.

Each material type can be tailored with various finish treatments. Portamet offers an extensive palette of colors through high-quality powder coatings and paints, including matte, satin, or glossy finishes, and even metallic or textured coatings. We can match virtually any specified shade, including historic colors or contemporary trends, to ensure your steel windows complement the overall design vision. 

Additionally, on interior surfaces, some clients opt for a bare metal or clear-coated steel look (especially with stainless or Corten) to celebrate the material itself. All coatings and finishes we apply are built to withstand weather and UV exposure, ensuring that your windows remain as striking in appearance years down the line as they are on day one.

Thermally broken steel windows by Portamet not only look stunning – they are engineered to perform in demanding climates and conditions. Our Janisol Arte 2.0 windows are tested and rated for all key aspects of building envelope performance:

• Thermal Insulation: As noted, these steel systems achieve excellent U-values (down to ~0.8 W/m²K with appropriate glazing), meaning they meet or exceed energy codes in Europe (including Passive House-level targets in some configurations) and are well-suited for the insulated building envelopes required in the USA and UK. This high thermal performance helps reduce energy consumption and increases interior comfort.

• Air and Water Tightness: Advanced gaskets, weatherstrips, and precision-engineered joints ensure that our steel windows seal tightly against drafts and driving rain. Janisol Arte 2.0 windows are designed and tested to resist water penetration and air leakage under severe weather, keeping interiors dry and draft-free. The integrated weatherstrip groove in the profiles simplifies fabrication of a continuous, tight seal around the opening.

• Wind Load Resistance: The inherent strength of steel and the thoughtful design of the profiles allow these slim windows to withstand high wind loads. Even in exposed high-rise applications or coastal environments, they remain stable and secure. Extensive structural tests under wind pressure have proven their reliability.

• Sound Insulation: Thanks to the combination of dense steel frames and the ability to accommodate high-performance glazing (up to 47 mm thick units for triple glazing if needed), Janisol Arte 2.0 windows can achieve excellent acoustic insulation. They are capable of reducing noise (sound reduction index) by roughly 40-45 dB with the right glass specification, ensuring quiet interiors even in busy urban locations.

• Security and Safety: Portamet’s steel windows are built to protect. The Janisol Arte 2.0 system has been tested to burglar resistance class RC2 under EN 1627, indicating it can resist forced entry attempts to a high standard. We use multi-point locking hardware on our operable steel windows and doors for enhanced security, and tough steel frames naturally offer better intrusion resistance than weaker materials. Moreover, the system’s mechanical strength and impact resistance have been certified per EN 13115 and EN 13049, meaning our windows are proven to withstand heavy use and even impacts. For projects with specific security requirements, we can integrate laminated security glazing and specialty hardware as well. (Note: For fire protection needs, Jansen offers dedicated profiles – our team can advise on solutions if fire-rated steel glazing is required in your project.)

In summary, Portamet steel windows manufactured with Janisol Arte 2.0 profiles meet or exceed modern performance standards in every category – from energy efficiency to structural integrity and security. You get the beauty of classic steel windows without any compromise in comfort or safety.

Portamet is proud to serve clients worldwide, with a focus on Europe, the UK, and North America. No matter where your project is located, our team strives to provide a seamless experience from initial inquiry to final delivery. We regularly coordinate with international architects and builders and are familiar with the differing building regulations and performance criteria across regions. 

For example, we ensure our steel window assemblies for the EU market carry the appropriate CE markings and Declarations of Performance, while for the US we can provide testing data relevant to NFRC ratings, hurricane impact standards (if needed), or other local requirements. Our global experience means you can trust Portamet as your steel windows supplier worldwide, capable of meeting regional standards in thermal insulation, safety, and environmental compliance.

We offer shipping of our custom steel windows and doors to your site, securely crated and protected for transit. Our logistics team can handle export documentation and freight arrangements, making international delivery straightforward. 

Additionally, if you require installation services or on-site support, we can either dispatch our own skilled installers or work with trusted local partners, depending on the project scope and location. Proper installation is key to the long-term performance of steel windows, and we make sure that the windows are fitted correctly, sealed, and adjusted for optimal operation. 

With our guidance, you will enjoy a smooth installation process and the full benefits of the Janisol Arte 2.0 system once the project is complete.

In a market filled with various steel window options, Portamet’s Janisol Arte 2.0 steel windows stand out for their combination of unrivaled slimness, thermal performance, and authentic craftsmanship. We have studied the competition in both Europe and America, and we are confident that our product offering meets or surpasses what other steel window manufacturers provide. 

By partnering with Jansen and leveraging the state-of-the-art Arte 2.0 system, Portamet can deliver thermally broken steel windows and doors that truly tick every box: historical authenticity, modern comfort, strength, security, and bespoke luxury appearance.

When you work with Portamet, you’re not only getting a top-tier product but also the dedication of a team that cares about the success of your project. Our mission is to help you realize your architectural vision – whether that’s restoring a historical building to its former glory or creating a new masterpiece with striking steel-framed fenestration – and to do so with windows and doors that will perform reliably for generations.

Experience the Portamet difference with our Jansen Janisol Arte 2.0 steel windows and doors. Contact our team today to discuss your project requirements, request detailed information, or get a quotation. We are ready to assist you in bringing the elegance of slimline steel windows to your property, with the quality and expertise that have made Portamet a trusted name in steel window manufacturing worldwide.